Holographic waveguide display extension structure

Abstract

The invention relates to a holographic display device, in particular, a holographic waveguide display extension structure. The holographic waveguide display extension structure comprises a vertical extension portion and a horizontal extension portion. According to the vertical extension portion, a light beam emitted from an image source passes through a collimation system, thereafter irradiates the upper surface of a first coupling prism, enters the first coupling prism, and then is reflected by the inclined surface of the first coupling prism, and the reflected light beam enters a first holographic waveguide plate; and the light beam undergoes total reflection at the upper surface and lower surface of the first holographic waveguide grating, advances along the direction of the first holographic waveguide grating, and is emitted out from the vertical extension structure. The emitted light beam is coupled through a second coupling prism, the coupled light beam is inputted into the second holographic waveguide grating of the horizontal extension portion; and the light beam is emitted a plurality of times at the second holographic waveguide grating, and finally two-dimensional extension is realized. Compared with an ordinary optical structure, the structure of the invention has the advantages of simplicity in manufacture, high processability, structural compactness, small size, light weight, and the like, and can be applied to a portable display or head-mounted display device.

Description

technical field [0001] The invention relates to the technical field of holographic display, in particular to a holographic waveguide display extension structure. Background technique [0002] Holographic waveguide display technology is a new generation of collimated display technology based on holographic technology and waveguide technology. After the beam emitted by the image source passes through the collimation system, it is coupled into the holographic waveguide, propagates along the waveguide plate, and forms multiple shots. The field of view of the one-dimensionally expanded holographic waveguide is too small to meet the application conditions, so two-dimensional expansion is required. The two commonly used two-dimensional expansion methods are: realize two-dimensional expansion through four volume holographic grating structures, the structure uses too many holographic gratings, making it difficult to manufacture, and the coupling efficiency is not high; or using a co...

AI Technical Summary

Problems solved by technology

The field of view of the one-dimensionally expanded holographic waveguide is too small to meet the application conditions, so two-dimensional expansion is required

Two commonly used two-dimensional expansion methods are: to realize two-dimensional expansion through the structure of four volume holographic gratings, which uses too many holographic gratings, which is difficult to manufacture, and the coupling efficiency is not high; or the combination of waveguide rods and waveguide plates A holographic waveguide display system with two-dimensional expansion. This structure can see the bright external light while seeing the image source information. However, the coupling efficiency of the waveguide is low and the assembly is difficult.

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